profiling

Hello. I am trying to profile energy usage of all components in a laptop when running a simulation. I know that fans don't draw that much power but is it possible to estimate how much power fans draw in a laptop? As in are there built in sensors similar to those that estimate gpu and cpu power...

I have a gaming rig with an R7 370 Gaming Edition with 4GB of VRAM on GTA V it only says that I am using 2GB (the game auto adjusted) but I randomly started noticing that after about 1 or 2 hours of gameplay I would see small drops for a few seconds, I was fine with that until they started...